PCM Idle Learn Procedure: Procedure

How to use this Service Information .

The idle learn procedure must be done so the PCM can learn the engine idle characteristics.

Do the idle learn procedure whenever you do any of these actions:

• Replace the PCM.
• Reset the PCM.
• Update the PCM.
• Replace or clean the throttle body.
• When the engine or transmission is disassembled.

1. PCM Idle - Learn

   ■ Preconditions 

   • HDS Connected 
   • All electrical items (the A/C, the audio, the lights, etc.) are off.

   Procedure 

   1. Reset the PCM with the HDS - Refer to: PCM Reset 

   2. Turn the vehicle to the ON mode, and wait 2 seconds.

   3. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, or until the engine coolant temperature reaches 194 °F (90 °C).

   4. Let the engine idle for about 5 minutes with the throttle fully closed.

   NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.

   5. Turn the vehicle to the OFF (LOCK) mode.

   6. Jump the SCS line with the HDS.

   7. Wait 60 seconds, and exit the SCS mode with the HDS.

   8. Turn the vehicle to the ON mode.

   9. Make sure the Idle Learning is complete with the HDS. If it is not completed, check the throttle body - Refer to: Throttle Body Carbon Accumulation Check 

   10. Turn the vehicle to the OFF (LOCK) mode.